Of course I would never 'force' attention on strange dogs!! The point is that sometimes he wants a cuddle, other times he doesn't, with no apparent difference in circumstance. I can see now, as I write this, that it all sounds normal. It's hard to explain, but we know our dog and all I can say is that it is strange.
We have spent alot of time and money taking him to one-on-one dog training. He walks to heel, comes to the whistle and understands different whistle commands that mean different things ie. 'come here now' or 'I'm changing direction, take note'. He understands a whole range of words and sentances, whatever tone of voice they are spoken in. He is trained never to bother livestock, and to ignore other dogs on walks, unless they want to play. People constantly comment on his wonderful behaviour and training. I just wish I knew what is behind all this grumpiness, when it's all come on gradually.